fix: use the correct measurement name and tags for aggregated pending events metrics

[atzoum]

Description

Fix, using the correct measurement name and tags for aggregate metrics.

Previously the following measurement was recorded:

jobsdb_ALL_pending_events_count workspace=ALL,destType=<type>

Now:
jobsdb_rt_pending_events_count workspace=ALL,destType=ALL
jobsdb_batch_rt_pending_events_count workspace=ALL,destType=ALL

Notion Ticket

https://www.notion.so/rudderstacks/Use-the-correct-measurement-name-and-tags-for-aggregated-pending-events-metrics-dbfc88275e9e4652ad4067f58c24c214

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Merging #1891 (ef6827c) into master (4d0992e) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1891      +/-   ##
==========================================
- Coverage   25.14%   25.11%   -0.03%     
==========================================
  Files         120      120              
  Lines       28961    28961              
==========================================
- Hits         7282     7275       -7     
- Misses      21343    21346       +3     
- Partials      336      340       +4     

Impacted Files	Coverage Δ
...ebugger/destination/eventDeliveryStatusUploader.go	90.12% <0.00%> (-3.71%)	⬇️
services/debugger/uploader.go	97.24% <0.00%> (-2.76%)	⬇️
gateway/gateway.go	47.35% <0.00%> (-0.26%)	⬇️
router/router.go	64.67% <0.00%> (+0.11%)	⬆️

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